• Kurv-Baks
PAI Kurv-Bak™ hard rubber back-up rings can be made in a variety of materials to help prevent early seal failure at higher pressures.
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Item #

Nominal C/S (inches)

Nominal I.D. (inches)

Nominal O.D. (inches)

Thickness (Inches)

I.D. (inches)

O.D. (Inches)

N/A 1/16 N/A 7/64 N/A 15/64 N/A .049 N/A 0.127 N/A .233
N/A 1/16 N/A 1/8 N/A 1/4 N/A .049 N/A 0.140 N/A .246
N/A 1/16 N/A 5/32 N/A 9/32 N/A .049 N/A 0.171 N/A .277
N/A 1/16 N/A 3/16 N/A 5/16 N/A .049 N/A 0.202 N/A .308
N/A 1/16 N/A 7/32 N/A 11/32 N/A .049 N/A 0.234 N/A .340
N/A 1/16 N/A 1/4 N/A 3/8 N/A .049 N/A 0.265 N/A .371
N/A 1/16 N/A 5/16 N/A 7/16 N/A .049 N/A 0.327 N/A .433
N/A 1/16 N/A 3/8 N/A 1/2 N/A .049 N/A 0.390 N/A .496
N/A 1/16 N/A 7/16 N/A 9/16 N/A .049 N/A 0.455 N/A .561
N/A 1/16 N/A 1/2 N/A 5/8 N/A .049 N/A .518 N/A .624
N/A 1/16 N/A 9/16 N/A 11/16 N/A .049 N/A 0.580 N/A .686
N/A 1/16 N/A 5/8 N/A 3/4 N/A .049 N/A 0.643 N/A .749
N/A 1/16 N/A 11/16 N/A 13/16 N/A .049 N/A 0.705 N/A .811
N/A 1/16 N/A 3/4 N/A 7/8 N/A .049 N/A 0.768 N/A .874
N/A 1/16 N/A 13/16 N/A 15/16 N/A .049 N/A .830 N/A .936
N/A 1/16 N/A 7/8 N/A 1 N/A .049 N/A 0.893 N/A .999
N/A 1/16 N/A 15/16 N/A 1 1/16 N/A .049 N/A .955 N/A 1.061
N/A 1/16 N/A 1 N/A 1 1/8 N/A .049 N/A 1.018 N/A 1.124
N/A 1/16 N/A 1 1/16 N/A 1 3/16 N/A .049 N/A 1.080 N/A 1.186
N/A 1/16 N/A 1 1/8 N/A 1 1/4 N/A .049 N/A 1.143 N/A 1.249
N/A 1/16 N/A 1 3/16 N/A 1 5/16 N/A .049 N/A 1.205 N/A 1.311
N/A 1/16 N/A 1 1/4 N/A 1 3/8 N/A .049 N/A 1.268 N/A 1.374
N/A 1/16 N/A 1 5/16 N/A 1 7/16 N/A .049 N/A 1.330 N/A 1.436
N/A 1/16 N/A 1 3/8 N/A 1 1/2 N/A .049 N/A 1.393 N/A 1.499
N/A 1/16 N/A 1 1/2 N/A 1 5/8 N/A .049 N/A 1.518 N/A 1.624
N/A 1/16 N/A 1 5/8 N/A 1 3/4 N/A .049 N/A 1.643 N/A 1.749
N/A 1/16 N/A 1 3/4 N/A 1 7/8 N/A .049 N/A 1.768 N/A 1.874
N/A 1/16 N/A 1 7/8 N/A 2 N/A .049 N/A 1.893 N/A 1.999
N/A 1/16 N/A 2 N/A 2 1/8 N/A .049 N/A 2.018 N/A 2.124
N/A 1/16 N/A 2 1/8 N/A 2 1/4 N/A .049 N/A 2.143 N/A 2.249
N/A 1/16 N/A 2 1/4 N/A 2 3/8 N/A .049 N/A 2.268 N/A 2.374
N/A 1/16 N/A 2 3/8 N/A 2 1/2 N/A .049 N/A 2.393 N/A 2.499
N/A 1/16 N/A 2 1/2 N/A 2 5/8 N/A .049 N/A 2.518 N/A 2.624
N/A 1/16 N/A 2 5/8 N/A 2 3/4 N/A .049 N/A 2.643 N/A 2.749
N/A 1/16 N/A 2 3/4 N/A 2 7/8 N/A .049 N/A 2.768 N/A 2.874
N/A 1/16 N/A 2 7/8 N/A 3 N/A .049 N/A 2.893 N/A 2.999
N/A 1/16 N/A 3 N/A 3 1/8 N/A .049 N/A 3.018 N/A 3.124
N/A 1/16 N/A 3 1/4 N/A 3 3/8 N/A .049 N/A 3.268 N/A 3.374
N/A 1/16 N/A 4.5 N/A 4 5/8 N/A .049 N/A 4.518 N/A 4.624
N/A 1/16 N/A 5 1/4 N/A 5 3/8 N/A .049 N/A 5.268 N/A 5.374
N/A 3/32 N/A N/A 1 1/2 N/A .053 N/A 1.331 N/A 1.503
N/A 3/32 N/A N/A 2 1/4 N/A .053 N/A 2.081 N/A 2.253
N/A 3/32 N/A N/A 2 1/2 N/A .053 N/A 2.331 N/A 2.503
N/A 3/32 N/A 3/32 N/A 9/32 N/A .053 N/A 0.109 N/A .281
N/A 3/32 N/A 1/8 N/A 5/16 N/A .053 N/A 0.140 N/A .312
N/A 3/32 N/A 3/16 N/A 3/8 N/A .053 N/A 0.202 N/A .374
N/A 3/32 N/A 7/32 N/A 13/32 N/A .053 N/A 0.234 N/A .406
N/A 3/32 N/A 1/4 N/A 7/16 N/A .053 N/A 0.265 N/A .437
N/A 3/32 N/A 5/16 N/A 1/2 N/A .053 N/A 0.327 N/A .499
N/A 3/32 N/A 3/8 N/A 9/16 N/A .053 N/A 0.390 N/A .562
N/A 3/32 N/A 7/16 N/A 5/8 N/A .053 N/A 0.452 N/A .624
N/A 3/32 N/A 1/2 N/A 11/16 N/A .053 N/A 0.515 N/A .687
N/A 3/32 N/A 9/16 N/A 3/4 N/A .053 N/A 0.577 N/A .749
N/A 3/32 N/A 5/8 N/A 13/16 N/A .053 N/A 0.640 N/A .812
N/A 3/32 N/A 11/16 N/A 7/8 N/A .053 N/A 0.702 N/A .874
N/A 3/32 N/A 3/4 N/A 15/16 N/A .053 N/A 0.765 N/A .937
N/A 3/32 N/A 13/16 N/A 1 N/A .053 N/A .831 N/A 1.003
N/A 3/32 N/A 7/8 N/A 1 1/16 N/A .053 N/A 0.893 N/A 1.065
N/A 3/32 N/A 15/16 N/A 1 1/8 N/A .053 N/A .956 N/A 1.128
N/A 3/32 N/A 1 N/A 1 3/16 N/A .053 N/A 1.018 N/A 1.190
N/A 3/32 N/A 1 1/16 N/A 1 1/4 N/A .053 N/A 1.081 N/A 1.253
N/A 3/32 N/A 1 1/8 N/A 1 5/16 N/A .053 N/A 1.143 N/A 1.315
N/A 3/32 N/A 1 3/16 N/A 1 3/8 N/A .053 N/A 1.206 N/A 1.378
N/A 3/32 N/A 1 1/4 N/A 1 7/16 N/A .053 N/A 1.268 N/A 1.440
N/A 3/32 N/A 1 3/8 N/A 1 9/16 N/A .053 N/A 1.393 N/A 1.565
N/A 3/32 N/A 1 7/16 N/A 1 5/8 N/A .053 N/A 1.456 N/A 1.628
N/A 3/32 N/A 1 1/2 N/A 1 11/16 N/A .053 N/A 1.518 N/A 1.690
N/A 3/32 N/A 1 9/16 N/A 1 3/4 N/A .053 N/A 1.581 N/A 1.753
N/A 3/32 N/A 1 5/8 N/A 1 13/16 N/A .053 N/A 1.643 N/A 1.815
N/A 3/32 N/A 1 11/16 N/A 1 7/8 N/A .053 N/A 1.706 N/A 1.878
N/A 3/32 N/A 1 3/4 N/A 1 15/16 N/A .053 N/A 1.768 N/A 1.940
N/A 3/32 N/A 1 13/16 N/A 2 N/A .053 N/A 1.831 N/A 2.003
N/A 3/32 N/A 1 7/8 N/A 2 1/16 N/A .053 N/A 1.893 N/A 2.065
N/A 3/32 N/A 1 15/16 N/A 2 1/8 N/A .053 N/A 1.956 N/A 2.128
N/A 3/32 N/A 2 N/A 2 3/16 N/A .053 N/A 2.018 N/A 2.190
N/A 3/32 N/A 2 1/8 N/A 2 5/16 N/A .053 N/A 2.143 N/A 2.315
N/A 3/32 N/A 2 3/16 N/A 2 3/8 N/A .053 N/A 2.206 N/A 2.378
N/A 3/32 N/A 2 1/4 N/A 2 7/16 N/A .053 N/A 2.268 N/A 2.440
N/A 3/32 N/A 2 3/8 N/A 2 9/16 N/A .053 N/A 2.393 N/A 2.565
N/A 3/32 N/A 2 7/16 N/A 2 5/8 N/A .053 N/A 2.456 N/A 2.628
N/A 3/32 N/A 2 1/2 N/A 2 11/16 N/A .053 N/A 2.518 N/A 2.690
N/A 3/32 N/A 2 9/16 N/A 2 3/4 N/A .053 N/A 2.581 N/A 2.753
N/A 3/32 N/A 2 5/8 N/A 2 13/16 N/A .053 N/A 2.643 N/A 2.815
N/A 3/32 N/A 2 11/16 N/A 2 7/8 N/A .053 N/A 2.706 N/A 2.878
N/A 3/32 N/A 2 3/4 N/A 2 15/16 N/A .053 N/A 2.768 N/A 2.940
N/A 3/32 N/A 2 13/16 N/A 3 N/A .053 N/A 2.831 N/A 3.003
N/A 3/32 N/A 2 7/8 N/A 3 1/16 N/A .053 N/A 2.893 N/A 3.065
N/A 3/32 N/A 3 N/A 3 3/16 N/A .053 N/A 3.018 N/A 3.190
N/A 3/32 N/A 3 1/4 N/A 3 7/16 N/A .053 N/A 3.268 N/A 3.440
N/A 3/32 N/A 3 1/2 N/A 3 11/16 N/A .053 N/A 3.518 N/A 3.690
N/A 3/32 N/A 3 3/4 N/A 3 15/16 N/A .053 N/A 3.768 N/A 3.940
N/A 3/32 N/A 4 N/A 4 3/16 N/A .053 N/A 4.018 N/A 4.190
N/A 3/32 N/A 4 1/4 N/A 4 7/16 N/A .053 N/A 4.268 N/A 4.440
N/A 3/32 N/A 4 3/4 N/A 4 15/16 N/A .053 N/A 4.768 N/A 4.940
N/A 3/32 N/A 4.5 N/A 4 11/16 N/A .053 N/A 4.518 N/A 4.690
N/A 3/32 N/A 5 N/A 5 3/16 N/A .053 N/A 5.018 N/A 5.190
N/A 3/32 N/A 5 1/2 N/A 5 11/16 N/A .053 N/A 5.518 N/A 5.690
N/A 3/32 N/A 5 3/4 N/A 5 15/16 N/A .053 N/A 5.768 N/A 5.940
N/A 3/32 N/A 6 N/A 6 3/16 N/A .053 N/A 6.018 N/A 6.190
N/A 3/32 N/A 6 1/4 N/A 6 7/16 N/A .053 N/A 6.268 N/A 6.440
N/A 3/32 N/A 6 3/4 N/A 6 15/16 N/A .053 N/A 6.768 N/A 6.940
N/A 3/32 N/A 7 N/A 7 3/16 N/A .053 N/A 7.018 N/A 7.190
N/A 3/32 N/A 7 1/4 N/A 7 7/16 N/A .053 N/A 7.268 N/A 7.440
N/A 1/8 N/A 3/16 N/A 7/16 N/A .050 N/A 0.202 N/A .438
N/A 1/8 N/A 1/4 N/A 1/2 N/A .050 N/A 0.265 N/A .501
N/A 1/8 N/A 5/16 N/A 9/16 N/A .050 N/A 0.327 N/A .563
N/A 1/8 N/A 3/8 N/A 5/8 N/A .050 N/A 0.390 N/A .626
N/A 1/8 N/A 7/16 N/A 11/16 N/A .050 N/A 0.455 N/A .691
N/A 1/8 N/A 1/2 N/A 3/4 N/A .050 N/A .518 N/A .754
N/A 1/8 N/A 9/16 N/A 13/16 N/A .050 N/A 0.580 N/A .816
N/A 1/8 N/A 5/8 N/A 7/8 N/A .050 N/A 0.643 N/A .879
N/A 1/8 N/A 11/16 N/A 15/16 N/A .050 N/A 0.705 N/A .941
N/A 1/8 N/A 3/4 N/A 1 N/A .050 N/A .766 N/A 1.002
N/A 1/8 N/A 13/16 N/A 1 1/16 N/A .050 N/A .828 N/A 1.064
N/A 1/8 N/A 7/8 N/A 1 1/8 N/A .050 N/A .891 N/A 1.127
N/A 1/8 N/A 15/16 N/A 1 3/16 N/A .050 N/A 0.953 N/A 1.189
N/A 1/8 N/A 1 N/A 1 1/4 N/A .050 N/A 1.016 N/A 1.252
N/A 1/8 N/A 1 1/16 N/A 1 5/16 N/A .050 N/A 1.078 N/A 1.314
N/A 1/8 N/A 1 1/8 N/A 1 3/8 N/A .050 N/A 1.141 N/A 1.377
N/A 1/8 N/A 1 3/16 N/A 1 7/16 N/A .050 N/A 1.203 N/A 1.439
N/A 1/8 N/A 1 1/4 N/A 1 1/2 N/A .050 N/A 1.266 N/A 1.502
N/A 1/8 N/A 1 5/16 N/A 1 9/16 N/A .050 N/A 1.334 N/A 1.570
N/A 1/8 N/A 1 3/8 N/A 1 5/8 N/A .050 N/A 1.397 N/A 1.633
N/A 1/8 N/A 1 7/16 N/A 1 11/16 N/A .050 N/A 1.459 N/A 1.695
N/A 1/8 N/A 1 1/2 N/A 1 3/4 N/A .050 N/A 1.522 N/A 1.758
N/A 1/8 N/A 1 5/8 N/A 1 7/8 N/A .050 N/A 1.647 N/A 1.883
N/A 1/8 N/A 1 3/4 N/A 2 N/A .050 N/A 1.772 N/A 2.008
N/A 1/8 N/A 1 7/8 N/A 2 1/8 N/A .050 N/A 1.897 N/A 2.133
N/A 1/8 N/A 2 N/A 2 1/4 N/A .050 N/A 2.022 N/A 2.258
N/A 1/8 N/A 2 1/8 N/A 2 3/8 N/A .050 N/A 2.147 N/A 2.383
N/A 1/8 N/A 2 1/4 N/A 2 1/2 N/A .050 N/A 2.272 N/A 2.508
N/A 1/8 N/A 2 3/8 N/A 2 5/8 N/A .050 N/A 2.397 N/A 2.633
N/A 1/8 N/A 2 1/2 N/A 2 3/4 N/A .050 N/A 2.522 N/A 2.758
N/A 1/8 N/A 2 5/8 N/A 2 7/8 N/A .050 N/A 2.631 N/A 2.867
N/A 1/8 N/A 2 3/4 N/A 3 N/A .050 N/A 2.756 N/A 2.992
N/A 1/8 N/A 2 7/8 N/A 3 1/8 N/A .050 N/A 2.881 N/A 3.117
N/A 1/8 N/A 3 N/A 3 1/4 N/A .050 N/A 3.006 N/A 3.242
N/A 1/8 N/A 3 1/8 N/A 3 3/8 N/A .050 N/A 3.131 N/A 3.367
N/A 1/8 N/A 3 1/4 N/A 3 1/2 N/A .050 N/A 3.256 N/A 3.492
N/A 1/8 N/A 3 3/8 N/A 3 5/8 N/A .050 N/A 3.381 N/A 3.617
N/A 1/8 N/A 3 1/2 N/A 3 3/4 N/A .050 N/A 3.506 N/A 3.742
N/A 1/8 N/A 3 5/8 N/A 3 7/8 N/A .050 N/A 3.631 N/A 3.867
N/A 1/8 N/A 3 3/4 N/A 4 N/A .050 N/A 3.756 N/A 3.992
N/A 1/8 N/A 3 7/8 N/A 4 1/8 N/A .050 N/A 3.881 N/A 4.117
N/A 1/8 N/A 4 N/A 4 1/4 N/A .050 N/A 4.006 N/A 4.242
N/A 1/8 N/A 4 1/8 N/A 4 3/8 N/A .050 N/A 4.131 N/A 4.367
N/A 1/8 N/A 4 1/4 N/A 4 1/2 N/A .050 N/A 4.256 N/A 4.492
N/A 1/8 N/A 4 3/8 N/A 4 5/8 N/A .050 N/A 4.381 N/A 4.617
N/A 1/8 N/A 4 5/8 N/A 4 7/8 N/A .050 N/A 4.631 N/A 4.867
N/A 1/8 N/A 4 3/4 N/A 5 N/A .050 N/A 4.768 N/A 5.004
N/A 1/8 N/A 4 7/8 N/A 5 1/8 N/A .050 N/A 4.893 N/A 5.129
N/A 1/8 N/A 4.5 N/A 4 3/4 N/A .050 N/A 4.506 N/A 4.742
N/A 1/8 N/A 5 N/A 5 1/4 N/A .050 N/A 5.018 N/A 5.254
N/A 1/8 N/A 5 1/8 N/A 5 3/8 N/A .050 N/A 5.143 N/A 5.379
N/A 1/8 N/A 5 1/4 N/A 5 1/2 N/A .050 N/A 5.268 N/A 5.504
N/A 1/8 N/A 5 3/8 N/A 5 5/8 N/A .050 N/A 5.393 N/A 5.629
N/A 1/8 N/A 5 1/2 N/A 5 3/4 N/A .050 N/A 5.518 N/A 5.754
N/A 1/8 N/A 5 5/8 N/A 5 7/8 N/A .050 N/A 5.643 N/A 5.879
N/A 1/8 N/A 5 3/4 N/A 6 N/A .050 N/A 5.768 N/A 6.004
N/A 1/8 N/A 5 7/8 N/A 6 1/8 N/A .050 N/A 5.893 N/A 6.129
N/A 1/8 N/A 6 N/A 6 1/4 N/A .050 N/A 6.018 N/A 6.254
N/A 1/8 N/A 6 1/4 N/A 6 1/2 N/A .050 N/A 6.268 N/A 6.504
N/A 1/8 N/A 6 1/2 N/A 6 3/4 N/A .050 N/A 6.518 N/A 6.754
N/A 1/8 N/A 6 3/4 N/A 7 N/A .050 N/A 6.768 N/A 7.004
N/A 1/8 N/A 7 N/A 7 1/4 N/A .050 N/A 7.018 N/A 7.254
N/A 1/8 N/A 7 1/4 N/A 7 1/2 N/A .050 N/A 7.268 N/A 7.504
N/A 1/8 N/A 7 1/2 N/A 7 3/4 N/A .050 N/A 7.518 N/A 7.754
N/A 1/8 N/A 7 3/4 N/A 8 N/A .050 N/A 7.768 N/A 8.004
N/A 1/8 N/A 8 N/A 8 1/4 N/A .050 N/A 8.018 N/A 8.254
N/A 1/8 N/A 8 1/4 N/A 8 1/2 N/A .050 N/A 8.268 N/A 8.504
N/A 1/8 N/A 8 1/2 N/A 8 3/4 N/A .050 N/A 8.518 N/A 8.754
N/A 1/8 N/A 8 3/4 N/A 9 N/A .050 N/A 8.768 N/A 9.004
N/A 1/8 N/A 9 1/4 N/A 9 1/2 N/A .050 N/A 9.268 N/A 9.504
N/A 1/8 N/A 9 1/2 N/A 9 3/4 N/A .050 N/A 9.518 N/A 9.754
N/A 1/8 N/A 9 3/4 N/A 10 N/A .050 N/A 9.768 N/A 10.004
N/A 1/8 N/A 10 N/A 10 1/2 N/A .050 N/A 10.018 N/A 10.254
N/A 1/8 N/A 10 1/2 N/A 10 3/4 N/A .050 N/A 10.518 N/A 10.754
N/A 1/8 N/A 11 N/A 11 1/4 N/A .050 N/A 11.018 N/A 11.254
N/A 1/8 N/A 12 N/A 12 1/4 N/A .050 N/A 12.018 N/A 12.254
N/A 1/8 N/A 13 N/A 13 1/4 N/A .050 N/A 13.018 N/A 13.254
N/A 1/8 N/A 15 N/A 15 1/4 N/A .050 N/A 15.018 N/A 15.254
N/A 3/16 N/A 1/2 N/A 7/8 N/A .076 N/A .513 N/A .879
N/A 3/16 N/A 5/8 N/A 1 N/A .076 N/A 0.638 N/A 1.004
N/A 3/16 N/A 3/4 N/A 1 1/8 N/A .076 N/A .763 N/A 1.129
N/A 3/16 N/A 13/16 N/A 1 3/16 N/A .076 N/A 0.825 N/A 1.191
N/A 3/16 N/A 7/8 N/A 1 1/4 N/A .076 N/A 0.888 N/A 1.254
N/A 3/16 N/A 15/16 N/A 1 5/16 N/A .076 N/A 0.950 N/A 1.316
N/A 3/16 N/A 1 N/A 1 3/8 N/A .076 N/A 1.013 N/A 1.379
N/A 3/16 N/A 1 1/8 N/A 1 1/2 N/A .076 N/A 1.138 N/A 1.504
N/A 3/16 N/A 1 3/16 N/A 1 9/16 N/A .076 N/A 1.200 N/A 1.566
N/A 3/16 N/A 1 1/4 N/A 1 5/8 N/A .076 N/A 1.263 N/A 1.629
N/A 3/16 N/A 1 5/16 N/A 1 11/16 N/A .076 N/A 1.316 N/A 1.682
N/A 3/16 N/A 1 3/8 N/A 1 3/4 N/A .076 N/A 1.388 N/A 1.754
N/A 3/16 N/A 1 1/2 N/A 1 7/8 N/A .076 N/A 1.513 N/A 1.879
N/A 3/16 N/A 1 5/8 N/A 2 N/A .076 N/A 1.638 N/A 2.004
N/A 3/16 N/A 1 3/4 N/A 2 1/8 N/A .076 N/A 1.763 N/A 2.129
N/A 3/16 N/A 1 7/8 N/A 2 1/4 N/A .076 N/A 1.888 N/A 2.254
N/A 3/16 N/A 2 N/A 2 3/8 N/A .050 N/A 2.013 N/A 2.379
N/A 3/16 N/A 2 1/8 N/A 2 1/2 N/A .076 N/A 2.138 N/A 2.504
N/A 3/16 N/A 2 1/4 N/A 2 5/8 N/A .076 N/A 2.268 N/A 2.634
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